Camera optical lens

ABSTRACT

The present disclosure relates to optical lens, and provides a camera optical lens including eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.80; and −20.00≤(R9+R10)/(R9−R10)≤−2.50. The camera optical lens can achieve good optical performance while meeting design requirements for a long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to optical lens, particularly, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors and PC lenses.

BACKGROUND

With an emergence of smart phones in recent years, a demand for miniature camera lens is increasing day by day. However, in general, photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor). As a progress of semiconductor manufacturing technology makes a pixel size of the photosensitive devices become smaller, in addition to a current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with a development of technology and an increase of diverse demands of users, as a pixel area of the photosensitive devices is becoming smaller and smaller and a requirement of the system on the imaging quality is improving constantly, an eight-piece lens structure gradually appears in lens designs. Although a typical eight-piece lens already has a good optical performance, its refractive power, lens spacing and lens shape remain unreasonable to some extent, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for a long focal length and ultra-thinness.

SUMMARY

Some embodiments of the present disclosure provide a camera optical lens. The camera optical lens includes eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power. The camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.80; and −20.00≤(R9+R10)/(R9−R10)≤−2.50, where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens.

As an improvement, the camera optical lens satisfies the following condition: 1.30≤d12/d13≤5.50, where d12 denotes an on-axis distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens; d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.20≤f1/f≤0.81; −1.70≤(R1+R2)/(R1−R2)≤−0.48; and 0.05≤d1/TTL≤0.25, where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of an object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens satisfies the following conditions: −2.11≤(R3+R4)/(R3−R4)≤0.97; and 0.02≤d3/TTL≤0.07, where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens satisfies the following conditions: −2.53≤f3/f≤−0.46; 0.62≤(R5+R6)/(R5−R6)≤3.93; and 0.02≤d5/TTL≤0.05, where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens satisfies the following conditions: −3.18≤f4/f≤6.19; −31.27≤(R7+R8)/(R7−R8)≤6.93; and 0.02≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens satisfies the following conditions: −3.07≤f5/f≤7293324.16; and 0.02≤d9/TTL≤0.05; where f5 denotes a focal length of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.62≤f6/f≤7.86; −9.84≤(R11+R12)/(R11−R12)≤−0.48; and 0.02≤d11/TTL≤0.09; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens satisfies the following conditions: −2.56≤f7/f≤6.54; −2.55≤(R13+R14)/(R13−R14)≤19.28; and 0.03≤d13/TTL≤0.18; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens satisfies the following conditions: −27.31≤f8/f≤−0.73; −33.65≤(R15+R16)/(R15−R16)≤11.25 and 0.03≤d15/TTL≤0.11; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

As an improvement, the camera optical lens satisfies the following condition: f/IH≥2.28 where IH denotes an image height of the camera optical lens.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate technical solutions according to embodiments of the present disclosure more clearly, accompanying drawings for describing the embodiments are introduced briefly in the following. Apparently, accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make objectives, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a schematic diagram of a structure of a camera optical lens 10 of Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a positive refractive power and the eighth lens L8 has a negative refractive power. In this embodiment, the first lens L1 has a positive refractive power, which facilitates improving performance of the camera optical lens 10. It should be appreciated that, in other embodiments, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have other refractive powers than that of this embodiment.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other materials.

In this embodiment, a total optical length from the object side surface of the first lens L1 to an image surface S1 of the camera optical lens 10 along an optical axis is defined as TTL, a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of an object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of an image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies the following condition: 0.95≤f/TTL (1); −4.00≤f2/f≤−1.80 (2); and −20.00≤(R9+R10)/(R9−R10)≤−2.50 (3).

The condition (1) specifies a ratio of the focal length f of the camera optical lens 10 to the total optical length TTL of the camera optical lens 10. When the condition (1) is satisfied, given the same total optical length TTL, the camera optical lens 10 has a longer focal length.

The condition (2) specifies a ratio of the focal length f2 of the second lens L2 to the focal length f of the camera optical lens 10, which can effectively balance a spherical aberration and a field curvature of the camera optical lens 10.

The condition (3) specifies a shape of the fifth lens L5. Within this condition (3), a deflection degree of the light passing through the lens can be alleviated, and an aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies the following condition: −19.87≤(R9+R10)/(R9−R10)≤−2.51.

An on-axis distance from an image-side surface of the sixth lens L6 to an object-side surface of the seventh lens L7 is defined as d12, and an on-axis thickness of the seventh lens L7 is defined as d13. The camera optical lens 10 satisfies the following condition: 1.30≤d12/d13≤5.50, which specifies a ratio of the on-axis distance from an image-side surface of the sixth lens L6 to an object-side surface of the seventh lens L7 to the on-axis thickness of the seventh lens L7. Within this condition, the total optical length of the camera optical lens 10 can be compressed, and ultra-thinness can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 1.35≤d12/d13≤5.40.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens is defined as f1. The camera optical lens 10 satisfies the following condition: 0.20≤f1/f≤0.81, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens 10 is facilitated, and the development of the lenses towards ultra-thinness is facilitated. Preferably, the camera optical lens 10 satisfies the following condition: 0.32≤f1/f≤0.64.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies the following condition: −1.70≤(R1+R2)/(R1−R2)≤−0.48. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: −1.06≤(R1+R2)/(R1−R2)≤−0.60.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.05≤d1/TTL≤0.25. Within this condition, ultra-thinness can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.09≤d1/TTL≤0.20.

In this embodiment, the second lens L2 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies the following condition: −2.11≤(R3+R4)/(R3−R4)≤0.97, which specifies a shape of the second lens L2. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the on-axis chromatic aberration. Preferably, the camera optical lens 10 satisfies the following condition: −1.32≤(R3+R4)/(R3−R4)≤0.77.

An on-axis thickness of the second lens L2 is defines as d3, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d3/TTL≤0.07. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d3/TTL≤0.06.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies the following condition: −2.53≤f3/f≤−0.46. With a reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.58≤f3/f≤−0.57.

A central curvature radius of an object-side surface of the third lens is defined as R5; a central curvature radius of an image-side surface of the third lens is defined as R6, and the camera optical lens 10 satisfies the following condition: 0.62≤(R5+R6)/(R5−R6)≤3.93, which can effectively control a shape of the third lens L3 and is better for the shaping of the third lens L3. Within this condition, a deflection degree of the light passing through the lens can be alleviated, and an aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies the following condition: 0.99≤d5/TTL≤3.15.

An on-axis thickness of the third lens L3 is defined as d5 the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d5/TTL≤0.05. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d5/TTL≤0.04.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 satisfies the following condition: −3.18≤f4/f≤6.19. With a reasonable distribution of the focal power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.99≤f4/f≤4.95.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies the following condition: −31.27≤(R7+R8)/(R7−R8)≤6.93, which specifies a shape of the fourth lens L4. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −19.54≤(R7+R8)/(R7−R8)≤5.55.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d7/TTL≤0.05. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d7/TTL≤0.04.

In this embodiment, the fifth lens L5 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 satisfies the following condition: −3.07≤f5/f≤7293324.16, which specifies the fifth lens L5 so as to make a light angle of the camera optical lens 10 to be gentle and reduce tolerance sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.92≤f5/f≤5834659.33.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d9/TTL≤0.05. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d9/TTL≤0.04.

In this embodiment, the sixth lens L6 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies the following condition: 0.62≤f6/f≤7.86. With a reasonable distribution of the focal power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.00≤f6/f≤6.29.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies the following condition: −9.84≤(R11+R12)/(R11−R12)≤−0.48, which specifies a shape of the sixth lens L6. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −6.15≤(R11+R12)/(R11−R12)≤−0.60.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d11/TTL≤0.09. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d11/TTL≤0.07.

In this embodiment, the seventh lens L7 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies the following condition: −2.56≤f7/f≤6.54. With a reasonable distribution of the focal power, the system has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.60≤f7/f≤5.23.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies the following condition: −2.55≤(R13+R14)/(R13−R14)≤19.28, which specifies a shape of the seventh lens L7. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −1.59≤(R13+R14)/(R13−R14)≤15.42.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d13/TTL≤0.18. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies the following condition: 0.05≤d13/TTL≤0.14.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies the following condition: −27.3≤f8/f≤−0.73. With a reasonable distribution of the focal power, the system has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −17.07≤f8/f≤−0.92.

A central curvature radius of the object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of the image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies the following condition: −33.65≤(R15+R16)/(R15−R16)≤11.25, which specifies a shape of the eighth lens L8. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −21.03≤(R15+R16)/(R15−R16)≤9.00.

An on-axis thickness of the eighth lens L8 is defined as d15 and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d15/TTL≤0.11. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.05≤d15/TTL≤0.09.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies the following condition: f/IH≥2.28, which facilitates achieving a long focal length of the camera optical lens 10.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: TTL/IH≤2.40, which facilitates ultra-thinness of the camera optical lens 10.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-discussed embodiment.

When the above relationships are satisfied, the camera optical lens 10 meets the design requirements of a long focal length and ultra-thinness while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface S1 of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of each lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0= −0.674 R1 1.626 d1= 0.944 nd1 1.5444 ν1 55.82 R2 −20.188 d2= 0.025 R3 −17.570 d3= 0.210 nd2 1.6700 ν2 19.39 R4 −673.620 d4= 0.050 R5 11.174 d5= 0.200 nd3 1.6153 ν3 25.94 R6 3.549 d6= 0.030 R7 3.733 d7= 0.200 nd4 1.6700 ν4 19.39 R8 2.405 d8= 0.362 R9 −3.062 d9= 0.200 nd5 1.5444 ν5 55.82 R10 −7.119 d10= 0.024 R11 4.132 d11= 0.236 nd6 1.6700 ν6 19.39 R12 6.983 d12= 1.779 R13 −4.128 d13= 0.354 nd7 1.6700 ν7 19.39 R14 −3.532 d14= 0.058 R15 −2.473 d15= 0.447 nd8 1.5444 ν8 55.82 R16 −6.851 d16= 0.081 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.588

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of the object-side surface of the eighth lens L8;

R16: central curvature radius of the image-side surface of the eighth lens

L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6F;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface Si;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

nd8: refractive index of the d line of the eighth lens L8;

ndg: refractive index of the d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −6.3660E−02 3.1306E−04 −5.9288E−03 2.8602E−02 −6.7365E−02  9.7108E−02 R2  9.2039E+01 −4.4377E−02   4.1542E−01 −1.2664E+00   2.2678E+00 −2.5872E+00 R3 −9.9000E+01 1.1520E−02  2.5401E−01 −1.1097E+00   2.2614E+00 −2.7054E+00 R4 −9.9000E+01 1.2271E−01 −4.5272E−01 5.6575E−01  4.9350E−01 −2.5964E+00 R5 −9.1982E+01 −7.4405E−03  −1.8827E−01 4.5355E−01  1.0172E+00 −5.3265E+00 R6 −9.4213E+01 1.8553E−01 −1.3598E+00 4.0215E+00 −4.5854E+00 −1.5812E+00 R7 −9.7281E+01 2.9714E−01 −1.9128E+00 4.5222E+00 −3.5927E+00 −4.2958E+00 R8 −9.8772E−01 1.0920E−01 −7.1044E−01 1.3975E+00 −5.7846E−01 −3.3274E−01 R9  6.4798E+00 4.6752E−01 −1.2891E+00 1.7019E+00  6.9910E−02 −7.1070E+00 R10 −9.9000E+01 5.6388E−01 −2.1221E+00 4.9993E+00 −6.7046E+00  1.8406E+00 R11 −3.8801E+00 1.0093E−02 −5.5518E−01 2.2807E+00 −3.2977E+00  1.1473E+00 R12 −2.2212E+00 −1.4995E−01   3.9928E−01 −7.4892E−01   1.6648E+00 −2.0381E+00 R13  3.6745E−01 −7.3743E−02   5.4596E−02 −5.1291E−02   1.8377E−02  4.6713E−03 R14  9.3001E−01 4.9776E−02 −1.4487E−01 1.4132E−01 −9.2800E−02  4.0748E−02 R15 −3.5469E+00 1.3753E−01 −3.1308E−01 2.9473E−01 −1.6494E−01  5.8906E−02 R16 −1.7886E+01 −6.9556E−03  −5.7125E−02 4.5777E−02 −1.7002E−02  3.1318E−03 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −6.3660E−02 −8.6937E−02   4.6708E−02 −1.3784E−02   1.6706E−03 R2  9.2039E+01 1.9026E+00 −8.7014E−01 2.2366E−01 −2.4559E−02 R3 −9.9000E+01 2.0134E+00 −9.1257E−01 2.2923E−01 −2.4418E−02 R4 −9.9000E+01 3.7631E+00 −2.7931E+00 1.0793E+00 −1.7276E−01 R5 −9.1982E+01 8.7032E+00 −7.1264E+00 2.9782E+00 −5.0515E−01 R6 −9.4213E+01 9.3537E+00 −9.7473E+00 4.4953E+00 −7.9316E−01 R7 −9.7281E+01 1.2965E+01 −1.3349E+01 6.7753E+00 −1.4146E+00 R8 −9.8772E−01 −2.4764E+00   8.2347E+00 −9.2020E+00   3.7602E+00 R9  6.4798E+00 1.7821E+01 −2.2286E+01 1.4502E+01 −3.8708E+00 R10 −9.9000E+01 7.5460E+00 −1.1425E+01 6.9986E+00 −1.6906E+00 R11 −3.8801E+00 2.4639E+00 −3.4858E+00 1.8380E+00 −3.6866E−01 R12 −2.2212E+00 1.0557E+00  6.8784E−02 −2.8769E−01   8.1998E−02 R13  3.6745E−01 −5.0628E−03   1.4277E−03 −1.7749E−04   8.2764E−06 R14  9.3001E−01 −1.0969E−02   1.7050E−03 −1.3774E−04   4.3042E−06 R15 −3.5469E+00 −1.3518E−02   1.9370E−03 −1.5819E−04   5.6286E−06 R16 −1.7886E+01 −2.2933E−04  −2.7172E−06 −1.6427E−07   1.6129E−07

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (4)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (4). However, the present disclosure is not limited to the aspheric polynomials form shown in the formula (4).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refer to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refer to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) Inflexion Inflexion Inflexion Inflexion of inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 1 1.325 / / / P1R2 2 0.425 1.085 / / P2R1 4 0.355 0.575 0.745 1.155 P2R2 3 0.035 0.455 0.745 / P3R1 0 / / / / P3R2 2 0.675 0.935 / / P4R1 4 0.395 0.605 0.795 0.915 P4R2 0 / / / / P5R1 0 / / / / P5R2 2 0.165 0.565 / / P6R1 1 1.015 / / / P6R2 1 1.065 / / / P7R1 2 1.355 1.955 / / P7R2 2 1.465 2.065 / / P8R1 1 1.575 / / / P8R2 1 2.095 / / /

TABLE 4 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 2 0.895 1.175 P2R1 1 0.925 / P2R2 1 0.055 / P3R1 0 / / P3R2 0 / / P4R1 0 / / P4R2 0 / / P5R1 0 / / P5R2 2 0.305 0.695 P6R1 0 / / P6R2 0 / / P7R1 0 / / P7R2 0 / / P8R1 1 2.085 / P8R2 1 2.275 /

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 10, respectively. FIG. 4 illustrates a field curvature and a distortion with a wavelength of 555 nm after passing the camera optical lens 10. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 2.699 mm, an image height of 1.0H is 2.934 mm, and a field of view (FOV) in a diagonal direction is 46.51°. Thus, the camera optical lens 10 achieves a long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences are listed below.

Embodiment 2 provides a camera optical lens 20 structurally shown in FIG. 5. In this embodiment, the fourth lens has a positive refractive power, the fifth lens has a positive refractive power, and the seventh lens has a negative refractive power. The second lens L2 includes an image-side surface being concave in the paraxial region. The fifth lens L5 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region. The sixth lens L6 includes an image-side surface being convex in the paraxial region. The seventh lens L7 includes an image-side surface being concave in the paraxial region. The eighth lens L8 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0= −0.434 R1 2.243 d1= 0.768 nd1 1.5444 ν1 55.82 R2 −13.995 d2= 0.025 R3 −46.162 d3= 0.334 nd2 1.6700 ν2 19.39 R4 10.007 d4= 0.050 R5 4.739 d5= 0.230 nd3 1.6153 ν3 25.94 R6 2.123 d6= 0.100 R7 2.773 d7= 0.221 nd4 1.6700 ν4 19.39 R8 3.152 d8= 0.056 R9 1715660.779 d9= 0.241 nd5 1.5444 ν5 55.82 R10 1898626.917 d10= 0.611 R11 6.565 d11= 0.427 nd6 1.6700 ν6 19.39 R12 −40.049 d12= 1.156 R13 −6.029 d13= 0.830 nd7 1.6700 ν7 19.39 R14 23.484 d14= 0.094 R15 3.770 d15= 0.484 nd8 1.5444 ν8 55.82 R16 2.883 d16= 0.300 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.863

Table 6 shows aspheric surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1  1.9216E−01 −4.9643E−04   1.5224E−03 −7.4486E−04   4.6128E−03 −8.8449E−03  R2  5.9839E+01 −2.1455E−03   6.6208E−02 −1.7695E−01   2.7611E−01 −2.6484E−01  R3  9.9000E+01 1.2555E−02  2.0121E−02 −1.2611E−01   2.3493E−01 −2.5189E−01  R4 −7.3861E+01 6.4453E−02 −2.6325E−01 4.5474E−01 −3.5925E−01 −1.0795E−01  R5 −9.3463E+01 6.7766E−02 −4.2030E−01 7.6673E−01 −5.8574E−01 −2.4374E−01  R6 −1.3713E+01 7.5628E−02 −3.7257E−02 −1.1034E−02   6.7306E−02 −1.0262E−01  R7 −2.1419E+01 1.0968E−02  1.5679E−02 1.9425E−01 −1.1071E+00 2.2951E+00 R8 −1.2588E+01 −7.3451E−03  −1.1650E−01 4.7251E−01 −1.2025E+00 2.0010E+00 R9  9.9000E+01 1.9233E−01 −2.9828E−01 5.3349E−01 −5.3196E−01 2.7479E−01 R10 −9.9389E+01 1.3862E−01 −1.1565E−01 1.6213E−01 −1.3199E−01 5.7523E−02 R11 −9.6030E+00 1.0161E−02 −1.0994E−02 1.7540E−02 −1.0890E−02 −5.3951E−04  R12  9.6871E+01 −5.8875E−03  −6.8778E−03 1.2588E−02 −1.1071E−02 7.9970E−03 R13  1.4599E+01 −3.9721E−03  −3.5724E−02 2.3406E−02 −1.1004E−02 1.3669E−04 R14 −9.9000E+01 5.0558E−04 −3.0778E−02 3.5517E−02 −2.4878E−02 1.0850E−02 R15 −2.9354E+01 −5.7641E−02  −2.2494E−02 5.3793E−02 −3.9973E−02 1.6694E−02 R16 −1.4219E+01 −6.4978E−02   9.9596E−03 6.6426E−03 −6.5411E−03 2.7146E−03 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1  1.9216E−01  1.0042E−02 −6.3984E−03  2.1913E−03 −3.1293E−04 R2  5.9839E+01  1.5998E−01 −5.8003E−02  1.0993E−02 −7.4746E−04 R3  9.9000E+01  1.6914E−01 −6.7700E−02  1.3976E−02 −9.8726E−04 R4 −7.3861E+01  4.7174E−01 −3.9627E−01  1.4829E−01 −2.1480E−02 R5 −9.3463E+01  8.8148E−01 −7.4799E−01  2.9073E−01 −4.4513E−02 R6 −1.3713E+01  1.3375E−01 −1.4138E−01  8.9471E−02 −2.4482E−02 R7 −2.1419E+01 −2.4933E+00  1.5358E+00 −5.0066E−01  6.4249E−02 R8 −1.2588E+01 −2.1216E+00  1.4232E+00 −5.5222E−01  9.4139E−02 R9  9.9000E+01 −1.3973E−01  1.7783E−01 −1.3790E−01  3.7131E−02 R10 −9.9389E+01 −1.0039E−01  1.6316E−01 −1.0802E−01  2.5283E−02 R11 −9.6030E+00  6.7385E−03 −5.7912E−03  2.3104E−03 −3.8525E−04 R12  9.6871E+01 −4.7055E−03  1.5474E−03 −1.3266E−04 −4.4189E−05 R13  1.4599E+01  3.1734E−03 −1.8324E−03  4.1529E−04 −3.3342E−05 R14 −9.9000E+01 −2.9384E−03  4.8110E−04 −4.3677E−05  1.6887E−06 R15 −2.9354E+01 −4.2249E−03  6.4287E−04 −5.4251E−05  1.9553E−06 R16 −1.4219E+01 −6.6062E−04  9.7274E−05 −8.0546E−06  2.8862E−07

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 0 / / / P1R2 1 0.825 / / P2R1 3 0.415 0.495 1.005 P2R2 1 0.625 / / P3R1 1 0.455 / / P3R2 1 1.035 / / P4R1 0 / / / P4R2 0 / / / P5R1 0 / / / P5R2 0 / / / P6R1 1 1.245 / / P6R2 0 / / / P7R1 0 / / / P7R2 1 0.535 / / P8R1 1 0.465 / / P8R2 1 0.545 / /

TABLE 8 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 1 1.215 P2R1 1 1.185 P2R2 1 1.035 P3R1 1 0.835 P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 1 0.895 P8R1 1 0.905 P8R2 1 1.075

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 20, respectively. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 20. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 2.703 mm, an image height of 1.0 H is 2.934 mm, and a field of view (FOV) in the diagonal direction is 46.51°. Thus, the camera optical lens 20 achieves a long focal length and ultra-thinness, the on-axis and off-axis aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences are listed below.

Embodiment 3 provides a camera optical lens 30 structurally shown in FIG. 9. In this embodiment, the fourth lens has a positive refractive power, and the seventh lens has a negative refractive power. The second lens L2 includes an image-side surface being concave in the paraxial region.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0= −0.682 R1 1.594 d1= 0.972 nd1 1.5444 ν1 55.82 R2 −12.129 d2= 0.025 R3 −14.336 d3= 0.210 nd2 1.6700 ν2 19.39 R4 37.433 d4= 0.050 R5 23.744 d5= 0.200 nd3 1.6153 ν3 25.94 R6 2.536 d6= 0.038 R7 2.628 d7= 0.201 nd4 1.6610 ν4 20.53 R8 3.066 d8= 0.341 R9 −3.148 d9= 0.200 nd5 1.5444 ν5 55.82 R10 −7.316 d10= 0.024 R11 8.192 d11= 0.215 nd6 1.6700 ν6 19.39 R12 12.371 d12= 1.860 R13 −5.081 d13= 0.351 nd7 1.6700 ν7 19.39 R14 −42.017 d14= 0.105 R15 −4.059 d15= 0.401 nd8 1.5444 ν8 55.82 R16 −4.572 d16= 0.081 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.399

Table 10 shows aspheric surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −8.7198E−02  1.8498E−03 −7.4634E−03 3.3053E−02 −8.1284E−02 1.2407E−01 R2 1.4553E+01 −5.2588E−02   6.9607E−01 −2.3949E+00   4.4316E+00 −4.9733E+00  R3 −9.9000E+01  −6.0967E−02   7.2246E−01 −2.6125E+00   4.9531E+00 −5.5898E+00  R4 −9.9000E+01  1.0831E−01 −5.7004E−01 1.8221E+00 −4.5085E+00 7.6317E+00 R5 6.9630E+01 1.7215E−01 −1.3544E+00 5.5287E+00 −1.3539E+01 2.0566E+01 R6 −7.3108E+01  4.4389E−01 −4.3416E+00 1.8851E+01 −4.6269E+01 7.0668E+01 R7 −8.7166E+01  4.5676E−01 −4.2391E+00 1.7049E+01 −3.9258E+01 5.6585E+01 R8 3.5531E+00 8.3715E−02 −4.2957E−01 4.4806E−01  2.6128E+00 −9.8396E+00  R9 6.7041E+00 6.1261E−01 −1.8983E+00 4.3578E+00 −1.0262E+01 1.8573E+01 R10 −7.7773E+01  8.9278E−01 −3.8766E+00 1.1347E+01 −2.4002E+01 3.2348E+01 R11 1.4376E+01 1.4798E−01 −1.5377E+00 5.7920E+00 −1.1404E+01 1.3388E+01 R12 4.4736E+01 −1.6822E−01   3.8733E−01 −6.3783E−01   1.3409E+00 −7.4470E−01  R13 3.3915E+00 −1.0687E−01  −1.8094E−02 2.0063E−01 −2.6642E−01 1.7004E−01 R14 9.9000E+01 −2.4350E−01   1.1024E−01 1.0769E−01 −1.8355E−01 1.0741E−01 R15 7.2773E−01 −2.3697E−01   3.3481E−01 −2.8443E−01   1.4704E−01 −4.6635E−02  R16 −9.9000E+01  −1.9953E−01   3.4127E−01 −3.8639E−01   2.5664E−01 −1.0346E−01  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −8.7198E−02  −1.1810E−01 6.7541E−02 −2.1200E−02 2.7518E−03 R2 1.4553E+01  3.4905E+00 −1.4995E+00   3.6047E−01 −3.7101E−02  R3 −9.9000E+01   3.8834E+00 −1.6171E+00   3.6566E−01 −3.3863E−02  R4 −9.9000E+01  −8.2903E+00 5.5621E+00 −2.1072E+00 3.4567E−01 R5 6.9630E+01 −1.9655E+01 1.1604E+01 −3.9035E+00 5.7989E−01 R6 −7.3108E+01  −6.9959E+01 4.4150E+01 −1.6182E+01 2.6141E+00 R7 −8.7166E+01  −5.2251E+01 2.9796E+01 −9.2108E+00 1.0659E+00 R8 3.5531E+00  1.3602E+01 −4.9474E+00  −5.7786E+00 4.6738E+00 R9 6.7041E+00 −2.4051E+01 2.1827E+01 −1.2633E+01 3.5582E+00 R10 −7.7773E+01  −2.5420E+01 9.5024E+00  3.7906E−02 −8.3582E−01  R11 1.4376E+01 −9.0277E+00 2.6778E+00  2.6363E−01 −2.6887E−01  R12 4.4736E+01 −1.6405E+00 2.7997E+00 −1.6300E+00 3.4092E−01 R13 3.3915E+00 −5.9894E−02 1.1931E−02 −1.2613E−03 5.4977E−05 R14 9.9000E+01 −3.2478E−02 5.4059E−03 −4.6841E−04 1.6384E−05 R15 7.2773E−01  9.0998E−03 −1.0595E−03   6.7148E−05 −1.7715E−06  R16 −9.9000E+01   2.5797E−02 −3.8978E−03   3.2716E−04 −1.1693E−05 

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens in the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) Inflexion Inflexion Inflexion Inflexion Inflexion of inflexion point point point point point points position 1 position 2 position 3 position 4 position 5 P1R1 1 1.325 / / / / P1R2 4 0.395 0.585 0.785 1.035 / P2R1 4 0.395 0.495 0.815 1.185 / P2R2 2 0.475 0.845 / / / P3R1 2 0.595 0.845 / / / P3R2 3 0.385 0.455 0.645 / / P4R1 5 0.355 0.555 0.675 0.845 0.965 P4R2 0 / / / / / P5R1 0 / / / / / P5R2 2 0.125 0.505 / / / P6R1 1 0.975 / / / / P6R2 3 0.245 0.435 1.035 / / P7R1 2 1.395 1.955 / / / P7R2 2 1.515 2.055 / / / P8R1 1 1.505 / / / / P8R2 1 2.165 / / / /

TABLE 12 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 1 1.065 / P2R2 2 0.715 0.935 P3R1 0 / / P3R2 1 0.885 / P4R1 0 / / P4R2 0 / / P5R1 0 / / P5R2 2 0.225 0.655 P6R1 0 / / P6R2 0 / / P7R1 0 / / P7R2 0 / / P8R1 1 2.205 / P8R2 0 / /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 30, respectively. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 30. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to the conditions according to the above conditions in the embodiments. Apparently, the camera optical lens 30 in the present embodiment satisfies the above conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 2.682 mm, an image height of 1.0H is 2.934 mm, and a field of view (FOV) in the diagonal direction is 46.50°. Thus, the camera optical lens 30 achieves long focal length and ultra-thinness, the on-axis and off-axis aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and Embodi- Embodi- Embodi- conditions ment 1 ment 2 ment 3 f/TTL 1.12 0.96 1.14 f2/f −3.99 −1.81 −2.28 (R9 + R10)/(R9 − R10) −2.51 −19.75 −2.51 f 6.693 6.704 6.706 f1 2.797 3.600 2.645 f2 −26.684 −12.133 −15.305 f3 −8.478 −6.426 −4.599 f4 −10.648 27.659 23.341 f5 −10.013 32596296.77 −10.288 f6 14.480 8.37 35.132 f7 29.173 −7.015 −8.580 f8 −7.349 −27.807 −91.566 f12 3.049 4.770 3.046 FNO 2.48 2.48 2.50 TTL 5.998 7.000 5.883 IH 2.934 2.934 2.934 FOV 46.51° 46.51° 46.50°

It will be understood by those of ordinary skill in the art that the embodiments described above are specific examples realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising eight lenses, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.80; and −20.00≤(R9+R10)/(R9−R10)≤−2.50; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; and R10 denotes a central curvature radius of an image-side surface of the fifth lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following condition: 1.30≤d12/d13≤5.50; where d12 denotes an on-axis distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.20≤f1/f≤0.81; −1.70≤(R1+R2)/(R1−R2)≤−0.48; and 0.05≤d1/TTL≤0.25; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of an object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −2.11≤(R3+R4)/(R3−R4)≤0.97; and 0.02≤d3/TTL≤0.07; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −2.53≤f3/f≤−0.46; 0.62≤(R5+R6)/(R5−R6)≤3.93; and 0.02≤d5/TTL≤0.05; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −3.18≤f4/f≤6.19; −31.27≤(R7+R8)/(R7−R8)≤6.93; and 0.02≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −3.07≤f5/f≤7293324.16; and 0.02≤d9/TTL≤0.05; where f5 denotes a focal length of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.62≤f6/f≤7.86; −9.84≤(R11+R12)/(R11−R12)≤−0.48; and 0.02≤d11/TTL≤0.09; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −2.56≤f7/f≤6.54; −2.55≤(R13+R14)/(R13−R14)≤19.28; and 0.03≤d13/TTL≤0.18; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −27.31≤f8/f≤−0.73; −33.65≤(R15+R16)/(R15−R16)≤11.25; and 0.03≤d15/TTL≤0.11; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.
 11. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following condition the following condition: f/IH≥2.28 where IH denotes an image height of the camera optical lens. 